C#生成JSON数据格式的函数

使用说明：
    对List<类> 集合使用的方法：
     List<TBL_CODE_MZ> objList = objAction.GetCODE_MByList(objTbl);
     string JsonSource = JSONHelper.ToJSON(objList); //当前页记录转成JSON格式
     但有个问题：
     日期型数据谁转换成：@123456789@这样的数据！？？？不知道谁碰到过没有！！！！

  对数据集的使用如：DataSet,DataTable
 

JSONHelper jsonHelp = new JSONHelper();

            jsonHelp.success = true;
            jsonHelp.totlalCount = getPrjListCount();
            
            foreach (DataRow dr in dsResult.Tables[0].Rows)
            {
                jsonHelp.AddItem("PRJ_ID", dr["PRJ_ID"].ToString());
                jsonHelp.AddItem("PRJ_NAME", dr["PRJ_NAME"].ToString());
                jsonHelp.AddItem("DEP_ID", dr["DEP_ID"].ToString());
                jsonHelp.AddItem("PRJ_MANID", dr["PRJ_MANID"].ToString());
                jsonHelp.AddItem("PRJ_STATE", dr["PRJ_STATE"].ToString());

                if (dr["PRJ_STARTDATE"] != DBNull.Value)
                {
                    jsonHelp.AddItem("PRJ_STARTDATE", Convert.ToDateTime(dr["PRJ_STARTDATE"]).ToString("yyyy/MM/dd"));
                }
                else
                {
                    jsonHelp.AddItem("PRJ_STARTDATE", string.Empty);
                }
                if (dr["PRJ_ENDDATE"] != DBNull.Value)
                {
                    jsonHelp.AddItem("PRJ_ENDDATE", Convert.ToDateTime(dr["PRJ_ENDDATE"]).ToString("yyyy/MM/dd"));
                }
                else
                {
                    jsonHelp.AddItem("PRJ_ENDDATE", string.Empty);
                }
                                
                jsonHelp.AddItem("PRJ_MEMO", dr["PRJ_MEMO"].ToString());
                jsonHelp.AddItem("CODE_NAME", dr["CODE_NAME"].ToString());
                jsonHelp.AddItem("DEP_NAME", dr["DEP_NAME"].ToString());
                jsonHelp.AddItem("USER_NAME", dr["USER_NAME"].ToString());
                jsonHelp.ItemOk();
            }

            string strResult = jsonHelp.ToString();

 

//######################JSONHelp.cs源码######################################//

using System;
using System.Collections;
using System.Collections.Generic; 
using System.Text; 
using System.Web.Script.Serialization;

namespace framework.common
{
    /**//// <summary>
    /// JSONHelper 的摘要说明
    /// </summary>
    public class JSONHelper
    {
        //对应JSON的singleInfo成员
        public string singleInfo = string.Empty;

        protected string _error = string.Empty;
        protected bool _success = true;
        protected long _totalCount = 0;
        protected System.Collections.ArrayList arrData = new ArrayList();
        
               
        public JSONHelper()
        {
            
        }
        public static string ToJSON(object obj)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            return serializer.Serialize(obj);
        }
        public static string ToJSON(object obj, int recursionDepth)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            serializer.RecursionLimit = recursionDepth;
            return serializer.Serialize(obj);
        }

        //对应于JSON的success成员
        设置success为TURE，代表成功#region 设置success为TURE，代表成功
        public bool success
        {
            get
            {
                return _success;
            }
            set
            {
                //如设置为true则清空error
                if (success) _error = string.Empty;
                _success = value;
            }
        }
        #endregion
        //对应于JSON的error成员
        public string error
        {
            get
            {
                return _error;
            }
            set
            {
                //如设置error，则自动设置success为false
                if (value != "") _success = false;
                _error = value;
            }
        }
        public long totlalCount
        {
            get { return _totalCount; }
            set { _totalCount = value; }
        }
        //重置，每次新生成一个json对象时必须执行该方法
        public void Reset()
        {
            _success = true;
            _error = string.Empty;
            singleInfo = string.Empty;
            arrData.Clear();
        }
        #region

        public void AddItem(string name, string value)
        {
            arrData.Add(""" + name + "":" + """ + value + """);
        }
        
        #endregion


        public void ItemOk()
        {
            arrData.Add("<BR>");
        }

        //序列化JSON对象，得到返回的JSON代码
        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("{");
            sb.Append("totalCount:" + totlalCount.ToString() + ",");
            sb.Append("success:" + _success.ToString().ToLower() + ",");
            sb.Append("error:"" + _error.Replace(""", "\"") + "",");
            sb.Append("singleInfo:"" + singleInfo.Replace(""", "\"") + "",");
            sb.Append("data:[");

            int index = 0;
            sb.Append("{");
            if (arrData.Count <= 0)
            {
                sb.Append("}]");
            }
            else
            {
                foreach (string val in arrData)
                {
                    index++;

                    if (val != "<BR>")
                    {
                        sb.Append(val + ",");
                    }
                    else
                    {
                        sb = sb.Replace(",", "", sb.Length - 1, 1);
                        sb.Append("},");
                        if (index < arrData.Count)
                        {
                            sb.Append("{");
                        }
                    }
                   
                }
                sb = sb.Replace(",", "", sb.Length - 1, 1);
                sb.Append("]");
            }
            
            sb.Append("}");
            return sb.ToString();
        }
    }
}